Method of preparing a paste or cake of deflocculated material.



EDWARD GOODRICH AGHESON,

. CANADA. METHOD rnnranme a rns'r's on can or; DnrLocoULA'rnn sm'rEn'IAL;

I we g I V s -No. 8ee,oe3. :Speciflcation otLettrsPatent. Patented Aug-4, 1908.

Applicstien flled October as, 1901. Serial No: seams.

To allwhom' it may concern: 1

Be it'known that I, EDWARD Goonnron Aonnson, a citizen of the United States, re-. Siding at Stamford township, in the county of Welland, Province of Ontario, Canada, have invented certain new and useful'Improvements in Methods of Preparing a Paste or Cake of Defiocculated Material, of which the following is a specification.

In my prior patent, No. 843,426, granted February ,5, 1907, I have described and claimed a method of disintegrating and defioceulating amorphous bodies by incor-' porating with them a solution having eiiects thereon like those due to tannin. The method of deflocculation is usually practiced by incorporating with the amorphous body "an aqueous solution containing tannin or equivalent reagent, and the resulting defiocculated material is so finel subdivided as to be ca able of remaining m'suspension for an in efinite period, and of passing through the finest filter paper. As described in said prior patent the amorphous 25 body to be defioceulated, in owdered form,

. is usually moistened or wetted with a solution of the modifying material-such as allotannic acid, catechu, orthe likes-an should lie-collected in the form of a paste or occulated character.

The object of the present invention is the provision of 'a" method-of collecting and re covering the defiocculated bodies.

I havediscovered that while the suspended 10 deflocculated body is capa stated of traversing the finest fabric after the same hasbeen subjected to suitable treatment to provide it with a. su erficial coating or loidal is employed in eontr.adistinction to which like rubber, viscose, nitrocellulose, cellulose esters, or compounds etc., etc., are capable of yielding coherent films when doposited from solution. Thus I have d1s-. covered that if ordinary filtering cloths be treated with a solution of rubber volatile solvents, either by 'immersingfthe cloths in the solution or brushing them with the solution, they arerendered capable of retaining the deflocculated body wh le permitting'the passage of-the sus ndmg hquid: and that by filtering the cloths so treated the suspended material is recovered in the form of a cake or [aste vnth out destruction or modification o -1ts deflecculated characterl As above stated other the mass is thoroughly worked as by means of a mortar or. uggingor thelike. When an especial y pure, fine and uniform product is desired the material as it comes from the mortar or other grinding machine is diluted withwater or other liquid in a suitable vessel, and the fine, disintegrated and deflocculated particles of the bod undergoing treatment are suspended inthe iquid and maybe caused to float into another vessel or ta and this i maiy be repeated one or more times.

2 40 nasmuch as the sus ended particles are capable as above state of passing through the finest fiIter'pa er or like media, it is impossible to collect them or to separate them om the' suspending liquid by an of the ordinary filtration methods, or by the use of the usual filtering media; and by reason of the fact thatthe particles remain in sus en sion for indefinite time the collecting met ods involving settlin and decantation are ob viouslg inapplica le As escri ed in said prior patent the material may be collected by first fiocculating it,

separating from solutions inthe form of may be used.

Instead of treating the cloth or other filtering medium with a solution of'rubber or equivalent materiah'it 1s quite possible to treat the filtering medium, more articularly when the same comprises a celnlose base, with a reagent or reagents capable of effecting a more or less complete transformation or modification of its substance and the de-' velo ment in lace of dsurface or ofcellu ose cellu ose esters, or other products havingt e desired properties.

I claim:

1. The method of preparing a paste or cal e of defincculated material which consists in first prepfaring a suspension containing a debut for many purposes, as for the prepara- 'fiocculatd body by treating the body'with a material having efi'ects thereon like those tion of lubricants, inks, paints, and the like,

ffnnrrnn arms. rn'rnn'r orsrcnl or sranronn TOWNSHIP, WELLAND COUNTY, ONTARIO;

Is as above filter paper, it is not capable of passing through a paper orcrystalloid, to indicate the class of materials iquid thrpugh' materials having like rubber the property of it is desirable. that the defiocculated body cake usually retaining more or less of the susending liquid without destroying its dem, or with a filling, 0 or containing a colloidal body. The word colin any of its,

due to tannin, and then separating the suspending liquid by passing the same through a colloidal filtering medium.

2. The inethod of preparing a paste or cal te of deflocculated material which conslsts 1n of deflocculated material which consists in first preparing a suspension containing a de- 1 fiocculated body, and then separating the sus ending liquid by passing the same through a fi tering medium having a surface or filling of rubber.

In testimony whereof, I aflix mysignature 2\ in presence of two witnesses.

) EDWARD GOODRICH ACHESOX. Witnesses: I

W. H. ARIsoN,'- H. B. Booms. 

